This question is missing the excerpts. I've found them online:
a) He would often hear them say how they appreciated all the new work his sister was doing even though, before, they had seen her as a girl who was somewhat useless and frequently been annoyed with her. But now the two of them, father and mother, would often both wait outside the door of Gregor's room while his sister tidied up in there, and as soon as she went out again she would have to tell them exactly how everything looked, what Gregor had eaten, how he had behaved this time and whether, perhaps, any slight improvement could be seen.
b) This was how Gregor received his food each day now, once in the morning while his parents and the maid were still asleep, and the second time after everyone had eaten their meal at midday as his parents would sleep for a little while then as well, and Gregor's sister would send the maid away on some errand. Gregor's father and mother certainly did not want him to starve either, but perhaps it would have been more than they could stand to have any more experience of his feeding than being told about it, and perhaps his sister wanted to spare them what distress she could as they were indeed suffering enough.
c) He spent the whole night there. Some of the time he passed in a light sleep, although he frequently woke from it in alarm because of his hunger, and some of the time was spent in worries and vague hopes which, however, always led to the same conclusion: for the time being he must remain calm, he must show patience and the greatest consideration so that his family could bear the unpleasantness that he, in his present condition, was forced to impose on them.
d) Once during that long evening, the door on one side of the room was opened very slightly and hurriedly closed again; later on the door on the other side did the same; it seemed that someone needed to enter the room but thought better of it. Gregor went and waited immediately by the door, resolved either to bring the timorous visitor into the room in some way or at least to find out who it was; but the door was opened no more that night and Gregor waited in vain.
Answer and Explanation:
Thoughtfulness means having consideration for the needs of others. The excerpt in which Gregor shows thoughtfulness for his family is found in letter c. Even though Gregor has been transformed into a bug, even though his family is now shunning him, disgusted at his very existence, he still maintains some slight thoughtfulness toward them. Notice that the excerpt says, " for the time being he must remain calm, he must show patience and the greatest consideration so that his family could bear the unpleasantness that he, in his present condition, was forced to impose on them.
" Gregor understands that his new condition is quite difficult for his family. He empathizes with their inability to deal with him. He understands their needs and chooses to be patient.
